ME NETWORKS LAB-->TCP SOCKETS

TCP SOCKETS

 

 Server :

 

#include<stdio.h>

#include<sys/types.h>

#include<sys/socket.h>

#include<netinet/in.h>

#define PORT 2020

#define BACKLOG 2

main()

{

int fd,fd1,sin_addr,i=0;

char content[30];

struct sockaddr_in server;

struct sockaddr_in client;

int sin_size;

if((fd=socket(AF_INET,SOCK_STREAM,IPPROTO_TCP))==-1)

{

printf("Socket() error\n");

exit(-1);

}

bzero((char *)&server,sizeof(server));

server.sin_family=AF_INET;

server.sin_port=htons(PORT);

server.sin_addr.s_addr=htonl(INADDR_ANY);

if(bind(fd,(struct sockaddr*)&server,sizeof(server))==-1)

{

printf("Bind() error");

exit(-1);

}

if(listen(fd,BACKLOG)==-1)

{

printf("listen() error\n");

exit(-1);

}

printf("\n The server is in listening mode……\n");

sin_size=sizeof(client);

if((fd1=accept(fd,(struct sockaddr*)&client,&sin_size))==-1)

{

printf("accept() error\n");

exit(-1);

}

i=0;

printf("Point to point connection, type EXIT to quit……\n");

 

if(!fork())

while(1)

{

i=recv(fd1,content,30,0);

content[i]='\0';

printf("%s\n",content);

if(!strcmp(content,"EXIT"))

{

printf("Client wants to close..");

break;

}

}

else

while(1)

{

scanf("%s",content);

send(fd1,content,30,0);

if(!strcmp(content,"EXIT"))

{

printf("Write mode on exit..");

break;

}

}

close(fd);

close(fd1);

}

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 Client :

 

#include<stdio.h>

#include<stdlib.h>

#include<sys/types.h>

#include<sys/socket.h>

#include<netinet/in.h>

#define PORT 2020

main()

{

int fd1,i;

char content[30];

struct sockaddr_in client;

if((fd1=socket(AF_INET,SOCK_STREAM,IPPROTO_TCP))==-1)

{

printf("Socket() error");

exit(-1);

}

bzero(&client,sizeof(client));

client.sin_family=AF_INET;

client.sin_port=htons(PORT);

if(connect(fd1,(struct sockaddr*)&client,sizeof(client))==-1)

{

printf("connect() error");

exit(-1);

}

printf("Point to point communication , type EXIT to quit……\n");

i=0;

if(!fork())

while(1)

{

i=recv(fd1,content,30,0);

content[i]='\0';

printf("%s\n",content);

if(!strcmp(content,"EXIT"))

{

break;

}

}

else

while(1)

{

scanf("%s",content);

send(fd1,content,30,0);

 

if(!strcmp(content,"EXIT"))

{

printf("Write mode on exit..");

break;

}

}

close(fd1);

}

 

OUTPUT:

 

Server side:

 

The server is in listening mode……

Point to point communication, Type EXIT to quit……

Hai

Hello

Good

Morning

Client wants to close..

EXIT

Write mode on exit..

 

 

Client side:

 

Point to point communication, Type EXIT to quit……

Hai

Hello

Good

Morning

EXIT

Write mode on exit..